Carbon Monoxide Detector Requirements for New Mexico Hotels and Short-Term Rentals

A New Mexico hotel operator takes the duty from the State Fire Marshal's rule. 10.25.5 NMAC, Public Safety and Law Enforcement, Chapter 25 State Fire Marshal, Part 5 Fire Prevention and Public Occupancy, was amended on 1 November 2022. At 10.25.5.2(A) it establishes "the state's minimum requirements" for structures and premises against the hazard of fire and explosion and against conditions hazardous to life, property or public welfare in their occupancy. At 10.25.5.7(E) it fixes the operative code as the currently adopted International Fire Code, 2021 edition.

The rule is filed under public safety, and the statute behind it sits in Chapter 59A, the Insurance Code. That filing is the practical reason the answer is hard to find, and it is why national summaries reach the wrong instrument.

The one they reach is the Construction Industries Division's adoption of the 2021 International Residential Code through 14.7.3 NMAC under NMSA 60-13-9(F). A residential code governs dwellings. It cannot classify a transient hotel, so its silence about lodging gets reported as New Mexico's silence about lodging.

Inside the fire code the chain is short. IFC 915.1.1 requires detection in Group I-1, I-2, I-4 and R occupancies where the conditions at 915.1.2 through 915.1.6 exist, and IBC 310.2 places transient hotels and motels in Group R-1. The fire marshal's rule leaves Chapter 9 alone: across the whole part, "915" and "carbon monoxide" each occur zero times, against 73 occurrences of "10.25.5" in the same search. The model text applies as published.

Group R-1 puts a hotel inside the rule, and 10.25.5.2(B) is where the boundary is drawn for everything smaller. The rule does not apply to "detached one- and two-family dwellings and townhouses not more than three stories above grade plane in height with a separate means of egress and their accessory structures... built to the New Mexico Residential Building Code except for those being used as commercial properties".

Read the last seven words carefully, because they carry the short-term rental answer. A detached house sits outside the fire marshal's rule while it is a house. Let it commercially and the exemption is withdrawn, and the same building comes under the same code as a hotel. New Mexico wrote the reversal into the exemption rather than into a separate licensing regime.

A host therefore has a single question to settle before anything technical: is this property being used as a commercial property. If it is, the residential carve-out has lapsed and 915.1.1 applies on its own terms.

Those terms are conditions in the building rather than the building's name. A carbon monoxide source, a producing forced-air furnace serving or sitting in the sleeping unit, an attached private garage, or a producing vehicle used inside will each bring a room into scope. A property meeting none of them is outside the trigger rather than exempt from the rule, and the distinction matters at the next appliance change.

Work from the fire marshal's rule and treat the residential code as background. An operator who builds a compliance file around 14.7.3 NMAC has documented the wrong instrument, and the gap will not show up until an inspector arrives citing a section the file does not mention.

Audit each sleeping unit against the four conditions in 915.1.1 and record the answer with its reason. The reason is what survives a renovation: a room that gains a gas fireplace, or a wing that gains an attached garage, moves into scope on the day the work is done.

For a host, settle the commercial-use question in writing first. The 10.25.5.2(B) exemption turns on how the property is being used rather than on how it was built, so the answer can change between seasons without anything about the building changing.

Keep the adoption date in the file. The rule was amended on 1 November 2022 and moved the operative edition to the 2021 International Fire Code, replacing the 2015 edition it previously named. A compliance letter written against the earlier edition describes a code that is no longer the one in force.

Because 10.25.5 NMAC amends nothing in Chapter 9, the placement and device language is the model text of the 2021 International Fire Code rather than a New Mexico variant. That is worth relying on: an operator can read Section 915 as published and know it is what applies.

Detection belongs in the sleeping units. For a hotel that means the guest rooms rather than a corridor device covering a floor, which is the substitution most often made during a retrofit and the one most likely to be found.

The existing-building route runs through the same rule rather than through a construction permit, because 10.25.5.2(A) frames the whole part as the state's minimum requirements for structures and premises in their occupancy. New Mexico's answer does not wait for work to start.

One instrument that looks relevant is not. 8.370.15.66 NMAC, the fire safety rule that ranks near the top of a search for New Mexico carbon monoxide requirements, binds licensed child care facilities. A lodging operator reading it is reading about a different occupancy.

The State Fire Marshal holds final authority on how the code applies, with permitting and inspection carried out in the political subdivision. That split explains most of the confusion an operator meets on the phone: the local office inspects, and the interpretation question goes to the state.

New Mexico then does something few states do, and it does it twice. 10.25.5.9(K) provides that the penalties in IFC Section 109.4 do not apply in New Mexico, substituting those authorised under NMSA 59A-52-24 and 59A-52-25. 10.25.5.9(L) does the same for the stop work order penalties at IFC Section 111.4.

The model code's enforcement text is therefore not the operative text here, even though its technical text is. An operator reading the published International Fire Code has the right requirements and the wrong consequences.

The substituted route also names its own escalation. NMSA 59A-52-25 attaches its penalty to violation of a final cease and desist order, and empowers the attorney general to bring a civil suit to enforce it on the relation of the state fire marshal. A carbon monoxide deficiency that is corrected on notice never reaches that machinery; one that is ignored after an order does.

New Mexico attaches a real, citable consequence, and it is not the one printed in the fire code. Through 10.25.5.9(K), the penalties authorised under NMSA 59A-52-24 apply in place of IFC Section 109.4.

Under 59A-52-24, a violation of Chapter 59A Article 52 or of the rules made under it is a misdemeanor punishable by a fine of not more than five hundred dollars, and "each day any such violation continues shall constitute a separate offense". The daily accrual is what makes the number matter: a $500 ceiling per offence is modest, and a $500 offence repeating every day a guest room stays uncovered is not.

A second provision sits behind it. Under NMSA 59A-52-25, a person, firm or corporation violating a final cease and desist order incurs five hundred dollars for each day the violation continues, and the attorney general may bring a civil suit to enforce that on the relation of the state fire marshal.

Both provisions sit in the Insurance Code, which is where New Mexico files its State Fire Marshal. An operator searching the public safety or construction titles for a penalty will not find one there.

This page states more than the penalties summary on this site does. That summary carried no established answer for New Mexico before these provisions were read. Where the summary and the provisions above disagree, the provisions are the answer.